Biome ships new lint rules and formatter fixes

New lint rule: useValidTestTitle (5eb5f09)

Biome adds a nursery rule that validates unit test suite/case titles, with ESLint/Vitest migration support and config/schema wiring. This broadens lint coverage for test code and makes the rule easier to adopt in existing codebases.

New lint rule: noObsoleteTags (0e9fe53)

A new HTML/JSX nursery rule flags obsolete HTML elements such as <font>. It ships with rule registration, diagnostics metadata, and HTML fixture coverage across HTML, Astro, Svelte, and Vue.

New lint rule: noReturnInFinally (0d49e24)

Biome now warns on return inside finally blocks, a pattern that can hide exceptions or change control flow in subtle ways. The change includes rule configuration and editor/backend integration so it can be enabled and migrated like other rules.

React 19.3 support for noUnknownAttribute (2107dae)

The JSX attribute rule now recognizes React 19.3+ DOM properties, including fullscreen handlers, credentialless, and maskType, with tag-specific restrictions where applicable. That reduces false positives for projects on newer React ranges while preserving checks for older setups.

Formatter fixes for tricky comments and unary expressions (dea163f, a9a5e9a, 76a302a)

Several JS/TS formatting bugs were fixed around comments influencing layout: type arguments now break cleanly before the closing > when comments force multiline formatting, unary expressions stop gaining redundant parentheses, and comments are preserved correctly with operatorLinebreak: before in binary-like expressions. These are correctness fixes that improve output stability on real-world code.

CSS/SCSS parsing and formatting got sharper (4ef1978, c58dd37)

The SCSS @forward parser now accepts valid underscore-prefixed export names, and the CSS formatter/parser test coverage was expanded accordingly. A smaller SCSS formatter tweak also improves include closing-comment handling and skips unnecessary include scans, tightening both correctness and performance.

Git ignore handling now respects nested negations (e19512a)

Biome now correctly processes files re-included by negation patterns in nested .gitignore files, even when the file starts with *. That fixes a real workflow bug where nested project files could be incorrectly left unprocessed.

Other misc changes

• GitHub reporter snapshot cleanup for nested directories (93dc615)
• JS formatter newline/comment fixes in type arguments and unary formatting tests
• use strict docs clarification and assorted lint/test snapshot updates
• Release/changeset housekeeping and dependency/config migration wiring